399520790 has 16 divisors (see below), whose sum is σ = 756987120. Its totient is φ = 151397280.

The previous prime is 399520789. The next prime is 399520817. The reversal of 399520790 is 97025993.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1051181 + ... + 1051560.

It is an arithmetic number, because the mean of its divisors is an integer number (47311695).

Almost surely, 2^399520790 is an apocalyptic number.

399520790 is a deficient number, since it is larger than the sum of its proper divisors (357466330).

399520790 is a wasteful number, since it uses less digits than its factorization.

399520790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102767.

The product of its (nonzero) digits is 153090, while the sum is 44.

The square root of 399520790 is about 19988.0161596893. The cubic root of 399520790 is about 736.5119446928.

The spelling of 399520790 in words is "three hundred ninety-nine million, five hundred twenty thousand, seven hundred ninety".